US8134371B2 - Signal generating circuit for detecting ground status - Google Patents

Signal generating circuit for detecting ground status Download PDF

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US8134371B2
US8134371B2 US12/312,279 US31227907A US8134371B2 US 8134371 B2 US8134371 B2 US 8134371B2 US 31227907 A US31227907 A US 31227907A US 8134371 B2 US8134371 B2 US 8134371B2
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resistor
chip
unit
diode
power supply
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US20090315538A1 (en
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Jun Han
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
    • G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
    • G01R27/16—Measuring impedance of element or network through which a current is passing from another source, e.g. cable, power line
    • G01R27/18—Measuring resistance to earth, i.e. line to ground

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  • the present invention relates to a signal generating circuit, and more particularly to a signal generating circuit for detecting ground status.
  • Signal generating circuit is a common circuit and widely applied to electrical or electronic industry, wherein the signal generating circuit comprises a signal outputting circuit, and a step down rectifier circuit or DC power supply unit.
  • the signal generating circuit comprises a signal outputting circuit, and a step down rectifier circuit or DC power supply unit.
  • An object of the present invention is to overcome the above drawbacks of the conventional technology, wherein the signal generating circuit for detecting ground status provides a security inspection for detecting its grounding status or detecting the grounding status of the power input cable or the electrical equipment.
  • the present invention provides a signal generating circuit for detecting ground status.
  • the signal generating circuit comprises a power supply input unit A and a step down DC power supply unit C connected to the power supply input unit A.
  • a power source is inputted into the power supply input unit A to pass through the step down DC power supply unit C to obtain a DC power source, which is for the need of a signal detection and process unit D, and then connecting to a resistor unit B and the signal detection and process unit D respectively to obtain and output a ground status signal.
  • the above object of the signal generating circuit for detecting ground status can further be achieved with the followings.
  • the resistor unit B comprises one or more resistors connected with each other in parallel or in series.
  • the resistor unit B comprises a resistor R A , a resistor R B , a resistor R C , and a resistor R D , wherein the resistor R A is connected to R B in series, wherein an input end of the resistors R A , R B in series is connected to a hot wire (live wire) of the power supply input unit A, and an output end of the resistors R A , R B in series is connected to an earth wire (ground wire) of the signal detection and process unit D.
  • the resistors R C , R D are connected in series, wherein an input end of the resistors R C , R D in series is connected to a neutral wire (null line) of the power supply input unit A, and an output end of the resistors R C , R D in series is connected to the ground wire of the signal detection and process unit D.
  • the resistor unit B comprises a resistor R A , a resistor R B , wherein the resistor R A is connected to R B in series, wherein an input end of the resistors R A , R B in series is connected to a hot wire of the power supply input unit A, and an output end of the resistors R A , R B in series is connected to a ground wire of the signal detection and process unit D.
  • the resistor unit B comprises a resistor R A , a resistor R B , a resistor R C , and a resistor R D , wherein the resistor R A is connected to R B in series, wherein an input end of the resistors R A , R B in series is connected to a hot wire of the power supply input unit A, and an output end of the resistors R A , R B in series is connected to an Vcc of the signal detection and process unit D.
  • the resistors R C , R D are connected in series, wherein an input end of the resistors R C , R D in series is connected to the neutral wire of the power supply input unit A, and an output end of the resistors R C , R D in series is connected to the Vcc of the signal detection and process unit D.
  • the resistor unit B comprises a resistor R A , a resistor R B , a resistor R C , and a resistor R D , wherein the resistor R A is connected to R B in series, wherein an input end of the resistors R A , R B in series is connected to a hot wire of the power supply input unit A, and an output end of the resistors R A , R B in series is connected to an Vcc of the signal detection and process unit D.
  • the signal detection and process unit D comprises a resistor R 1 , a resistor R 2 , a resistor R 3 , a resistor R 4 , a diode D 5 , a diode D 15 , a chip U 1 , wherein a positive pole of the diode D 15 is connected to a ground wire of the chip U 1 , and a negative pole of the diode D 15 is connected to a negative terminal ( ⁇ ) of the chip U 1 .
  • a voltage divider of the connected in series resistors R 1 , R 2 is parallel connected to a voltage divider of the connected in series resistors R 3 , R 4 and the diode D 5 .
  • a voltage divider connecting point 2 between the resistors R 1 and R 2 is connected to a position terminal (+) of the chip U 1 , wherein the other end of the resistor R 1 is connected to a Vcc of the chip U 1 , wherein the other end of the resistor R 2 is connected to a ground wire of the chip U 1 .
  • a voltage divider connecting point 3 of the resistors R 3 , R 4 , and the diode D 5 is connected to the negative terminal of the chip U 1 , wherein one end of the resistor R 4 is connected to the Vcc of the chip U 1 , and the other end of the resistor R 4 is connected to a positive pole of the diode D 5 , wherein a negative pole of the diode D 5 is connected to the voltage divider connecting point 3 .
  • One end of the resistor R 3 is connected to the ground wire of the chip U 1 , and the other end of the resistor R 3 is connected to the voltage divider connecting point 3 .
  • An output end of the resistor unit B is connected to the negative terminal of the chip U 1 .
  • a ground wire SGND of the power supply input unit A is connected to the negative terminal of the chip U 1 , and an output signal is connected to an output end of the chip U 1 .
  • the signal detection and process unit D comprises a resistor R 1 , a resistor R 2 , a resistor R 3 , a resistor R 4 , a diodes D 5 , a voltage regulator diode (Zener diode) ZD 1 , and a chip U 1 , wherein a negative pole of the voltage regulator diode ZD 1 is connected to a Vcc of the chip U 1 , and a positive pole of the voltage regulator diode ZD 1 is connected to a positive terminal of the chip U 1 .
  • a voltage divider of the connected in series resistors R 1 , R 2 is parallel connected to a voltage divider of the connected in series resistors R 3 , R 4 and the diode D 5 .
  • a voltage divider connecting point 2 between the resistors R 1 and R 2 is connected to a negative terminal of the chip U 1 , wherein the other end of the resistor R 1 is connected to a Vcc of the chip U 1 , wherein the other end of the resistor R 1 is connected to a ground wire of the chip U 1 .
  • a voltage divider connecting point 3 of the resistors R 3 , R 4 , and the diode D 5 is connected to the positive terminal of the chip U 1 , wherein one end of the resistor R 4 is connected to the Vcc of the chip U 1 , and the other end of the resistor R 4 is connected to a positive pole of the diode D 5 , wherein a negative pole of the diode D 5 is connected to the voltage divider connecting point 3 .
  • One end of the resistor R 3 is connected to the ground wire of the chip U 1 , and the other end of the resistor R 3 is connected to the voltage divider connecting point 3 .
  • An output end of the resistor unit B is connected to the Vcc of the chip U 1 .
  • a ground wire SGND of the power supply input unit A is connected to the positive terminal of the chip U 1 , and an output signal is connected to an output end of the chip U 1 .
  • the signal detection and process unit D comprises a resistor R 1 , a resistor R 2 , a resistor R 3 , a diodes D 1 , a diodes D 2 , and a chip U 1 , wherein one end of the resistor R 1 is connected to a ground wire SGND of the power supply input unit A, and the other end of the resistor R 1 is connected to one of the I/O pins of the chip U 1 through the connecting point 1 and 2 respectively.
  • a voltage divider of the connected in series resistors R 2 , R 3 is parallely connected to the connected in series diode D 1 and D 2 , wherein the other end of the resistor R 2 and an positive pole of the diode D 2 are connected to a ground wire GND pin 4 of the chip U 1 , and the other end of the resistor R 3 and a negative pole of the diode D 1 are connected to a power Vcc pin 8 of the chip U 1 .
  • An output end of the resistor unit B is connected to the ground wire GND pin 4 of the chip U 1 .
  • the present invention has the following advantages in comparison with the conventional technology.
  • the signal generating circuit can effectively detect the importation of power cables or electrical equipment grounding status, so as to ensure the safety of human bodies and the operation of the equipments.
  • FIG. 1 is a block diagram of the signal generating circuit for detecting the ground status according to the present invention.
  • FIG. 2 is a schematic signal generating circuit for detecting the ground status according to a first preferred embodiment of the present invention.
  • FIG. 3 is a schematic signal generating circuit for detecting the ground status according to a second preferred embodiment of the present invention.
  • FIG. 4 is a schematic signal generating circuit for detecting the ground status according to a third preferred embodiment of the present invention.
  • FIG. 5 is a schematic signal generating circuit for detecting the ground status according to a fourth preferred embodiment of the present invention.
  • FIG. 6 is a schematic signal generating circuit for detecting the ground status according to a fifth preferred embodiment of the present invention.
  • FIGS. 1 and 2 of the drawings a first preferred embodiment of the present invention is illustrated.
  • the signal generating circuit for detecting ground status comprises a power supply input unit A and a step down DC power supply unit C, wherein the power supply input unit A is connected to the step down DC power supply unit C, wherein a power source is inputted into the power supply input unit A to pass through the step down DC power supply unit C to obtain a DC power source, which is for the need of a signal detection and process unit D, and then connecting to a resistor unit B and the signal detection and process unit D respectively to obtain and output a ground status signal.
  • the resistor unit B comprises a resistor R A , a resistor R B , a resistor R C , and a resistor R D , wherein the resistor R A is connected to the resistor R B in series, wherein an input end of the resistors R A , R B in series is connected to a hot wire of the power supply input unit A, and an output end of the resistors R A , R B in series is connected to a ground wire of the signal detection and process unit D.
  • the resistors R C , R B are connected in series, wherein an input end of the resistors R C , R D in series is connected to the neutral wire of the power supply input unit A, and an output end of the resistors R C , R D in series is connected to the ground wire of the signal detection and process unit D.
  • the signal detection and process unit D comprises a resistor R 1 , a resistor R 2 , a resistor R 3 , a resistor R 4 , a diode D 5 , a diode D 15 , and a chip U 1 , wherein a positive pole of the diode D 15 is connected to a ground wire of the chip U 1 , and a negative pole of the diode D 15 is connected to a negative terminal of the chip U 1 .
  • a voltage divider of the connected in series resistors R 1 , R 2 is parallel connected to a voltage divider of the connected in series resistors R 3 , R 4 and the diode Ds.
  • a voltage divider connecting point 2 between the resistors R 1 and R 2 is connected to a positive terminal of the chip U 1 , wherein the other end of the resistor R 1 is connected to a Vcc of the chip U 1 , wherein the other end of the resistor R 2 is connected to a ground wire of the chip U 1 .
  • a voltage divider connecting point 3 of the resistors R 3 , R 4 , and the diode D 5 which is located in between the resistor R 3 and the resistor R 4 , diode D 5 , is connected to the negative terminal of the chip U 1 , wherein one end of the resistor R 4 is connected to the Vcc of the chip U 1 , and the other end of the resistor R 4 is connected to a positive pole of the diode D 5 , wherein a negative pole of the diode D 5 is connected to the voltage divider connecting point 3 .
  • One end of the resistor R 3 is connected to the ground wire of the chip U 1 , and the other end of the resistor R 3 is connected to the voltage divider connecting point 3 .
  • An output end of the resistor unit B is connected to the negative terminal of the chip U 1 .
  • a ground wire SGND of the power supply input unit A is connected to the negative terminal of the chip U 1 , and an output signal is connected to an output end of the chip U 1 .
  • FIGS. 1 and 3 of the drawings a second preferred embodiment of the present invention is illustrated.
  • the signal generating circuit for detecting ground status comprises a power supply input unit A and a step down DC power supply unit C, wherein the power supply input unit A is connected to the step down DC power supply unit C, wherein a power source is inputted into the power supply input unit A to pass through the step down DC power supply unit C to obtain a DC power source, which is for the need of a signal detection and process unit D, and then connecting to a resistor unit B and the signal detection and process unit D respectively to obtain and output a ground status signal.
  • the resistor unit B comprises a resistor R A , wherein an input end of the resistor unit B is connected to a hot wire of the power supply input unit A, and an output end of the resistor unit B is connected to a Vcc of the signal detection and process unit D.
  • the signal detection and process unit D comprises a resistor R 1 , a resistor R 2 , a resistor R 3 , a resistor R 4 , a diodes D 5 , a voltage regulator diode ZD 1 , and a chip U 1 , wherein a negative pole of the voltage regulator diode ZD 1 is connected to a Vcc of the chip U 1 , and a positive pole of the voltage regulator diode ZD 1 is connected to a positive terminal of the chip U 1 .
  • a voltage divider of the connected in series resistors R 1 , R 2 is parallel connected to a voltage divider of the connected in series resistors R 3 , R 4 and the diode D 5 .
  • a voltage divider connecting point 2 between the resistors R 1 and R 2 is connected to a negative terminal of the chip U 1 , wherein the other end of the resistor R 1 is connected to the Vcc of the chip U 1 , wherein the other end of the resistor R 2 is connected to a ground wire of the chip U 1 .
  • a voltage divider connecting point 3 of the resistors R 3 , R 4 , and the diode D 5 is connected to a positive terminal of the chip U 1 , wherein one end of the resistor R 4 is connected to the Vcc of the chip U 1 , and the other end of the resistor R 4 is connected to a positive pole of the diode D 5 , wherein a negative pole of the diode D 5 is connected to the voltage divider connecting point 3 .
  • One end of the resistor R 3 is connected to the ground wire of the chip U 1 , and the other end of the resistor R 3 is connected to the voltage divider connecting point 3 .
  • An output end of the resistor unit B is connected to the Vcc of the chip U 1 .
  • a ground wire SGND of the power supply input unit A is connected to the positive terminal of the chip U 1 , and an output signal is connected to an output end of the chip U 1 .
  • FIGS. 1 and 4 of the drawings a third preferred embodiment of the present is illustrated.
  • the signal generating circuit for detecting ground status comprises a power supply input unit A and a step down DC power supply unit C, wherein the power supply input unit A is connected to the step down DC power supply unit C, wherein a power source is inputted into the power supply input unit A to pass through the step down DC power supply unit C to obtain a DC power source, which is for the need of a signal detection and process unit D, and then connecting to a resistor unit B and the signal detection and process unit D respectively to obtain and output a ground status signal.
  • the resistor unit B comprises a resistor R A and a resistor R B , wherein the resistors R A , R B are connected in series, wherein an input end of the resistor unit B is connected to a hot wire of the power supply input unit A, and an output end of the resistor unit B is connected to a ground wire of the signal detection and process unit D.
  • the signal detection and process unit D comprises a resistor R 1 , a resistor R 2 , a resistor R 3 , a diodes D 1 , a diodes D 2 , and a chip U 1 , wherein one end of the resistor R 1 is connected to a ground wire SGND of the power supply input unit A, and the other end of the resistor R 1 is connected to one of the I/O pins of the chip U 1 through the voltage divider connecting point 1 and 2 respectively.
  • a voltage divider of the connected in series resistors R 2 , R 3 is parallely connected to the connected in series of the diode D 1 and the D 2 , wherein the other end of the resistor R 2 and an positive pole of the diode D 2 are connected to a ground wire GND pin 4 of the chip U 1 , and the other end of the resistor R 3 and a negative pole of the diode D 1 are connected to a power Vcc pin 8 of the chip U 1 .
  • An output end of the resistor unit B is connected to the ground wire GND pin 4 of the chip U 1 .
  • FIGS. 1 and 5 of the drawings a fifth preferred embodiment of the present invention is illustrated.
  • the signal generating circuit for detecting ground status comprises a power supply input unit A and a step down DC power supply unit C, wherein the power supply input unit A is connected to the step down DC power supply unit C, wherein a power source is inputted into the power supply input unit A to pass through the step down DC power supply unit C to obtain a DC power source, which is for the need of a signal detection and process unit D, and then connecting to a resistor unit B and the signal detection and process unit D respectively to obtain and output a ground status signal.
  • the resistor unit B comprises a resistor R A , a resistor R B , a resistor R C , and a resistor R D , wherein the resistor R A is connected to R B in series, wherein an input end of the resistors R A , R B connected in series is connected to a hot wire of the power supply input unit A, and an output end of the resistors R A , R B connected in series is connected to an Vcc of the signal detection and process unit D.
  • the resistors R C , R D are connected in series, wherein an input end of the resistors R C , R D in series is connected to the neutral wire of the power supply input unit A, and an output end of the resistors R C , R D in series is connected to the Vcc of the signal detection and process unit D.
  • the signal detection and process unit D comprises a resistor R 1 , a resistor R 2 , a resistor R 3 , a resistor R 4 , a diodes D 5 , a voltage regulator diode ZD 1 , and a chip U 1 , wherein a negative pole of the voltage regulator diode ZD 1 is connected to a Vcc of the chip U 1 , and a positive pole of the voltage regulator diode ZD 1 is connected to a negative terminal of the chip U 1 .
  • a voltage divider of the connected in series resistors R 1 , R 2 is parallel connected to a voltage divider of the connected in series resistors R 3 , R 4 and the diode D 5 .
  • a voltage divider connecting point 2 between the resistors R 1 and R 2 is connected to a positive terminal of the chip U 1 , wherein the other end of the resistor R 1 is connected to a Vcc of the chip U 1 , wherein the other end of the resistor R 2 is connected to a ground wire of the chip U 1 .
  • a voltage divider connecting point 3 of the resistors R 3 , R 4 , and the diode D 5 is connected to the negative terminal of the chip U 1 , wherein one end of the resistor R 4 is connected to the Vcc of the chip U 1 , and the other end of the resistor R 4 is connected to a positive pole of the diode D 5 , wherein a negative pole of the diode D 5 is connected to the voltage divider connecting point 3 .
  • One end of the resistor R 3 is connected to the ground wire of the chip U 1 , and the other end of the resistor R 3 is connected to the voltage divider connecting point 3 .
  • An output end of the resistor unit B is connected to the Vcc of the chip U 1 .
  • a ground wire SGND of the power supply input unit A is connected to the negative terminal of the chip U 1 , and an output signal is connected to an output end of the chip U 1 .
  • FIGS. 1 and 6 of the drawings a fifth preferred embodiment of the present invention is illustrated.
  • the signal generating circuit for detecting ground status comprises a power supply input unit A and a step down DC power supply unit C, wherein the power supply input unit A is connected to the step down DC power supply unit C, wherein a power source is inputted into the power supply input unit A to pass through the step down DC power supply unit C to obtain a DC power source, which is for the need of a signal detection and process unit D, and then connecting to a resistor unit B and the signal detection and process unit D respectively to obtain and output a ground status signal.
  • the resistor unit B comprises a resistor R A and a resistor R B , wherein the resistors R A , R B are connected in series, wherein an input end of the resistor unit B is connected to a hot wire of the power supply input unit A, and an output end of the resistor unit B is connected to a Vcc of the signal detection and process unit D.
  • the signal detection and process unit D comprises a resistor R 1 , a resistor R 2 , a resistor R 3 , a voltage regulator diode ZD 1 , and a chip U 1 , wherein one end of the resistor R 1 is connected to a ground wire SGND of the power supply input unit A, and the other end of the resistor R 1 is connected to a I/O pin 1 of the chip U 1 through the connecting point 1 and 2 respectively.
  • the voltage regulator diode ZD 1 is parallely connected to the resistor R 3 , wherein a negative pole of the voltage regulator diode ZD 1 is connected to a power Vcc pin 8 of the chip U 1 , and a positive pole of the voltage regulator diode ZD 1 is connected to a I/O pin 1 of the chip U 1 .
  • the resistor R 2 and the resistor R 3 are connected in series to form a voltage divider, wherein one end of the resistor R 2 is connected the voltage divider connecting point 1 , and the other end of the R 2 is connected to a ground wire GND pin 4 , and connected to the I/O pin 1 of the chip U 1 .

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
  • Details Of Connecting Devices For Male And Female Coupling (AREA)
  • Direct Current Feeding And Distribution (AREA)
  • Measurement Of Current Or Voltage (AREA)
US12/312,279 2006-11-23 2007-10-17 Signal generating circuit for detecting ground status Expired - Fee Related US8134371B2 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
CNB200610157046XA CN100458455C (zh) 2006-11-23 2006-11-23 对接地状态进行检测的信号产生电路
CN200610157046X 2006-11-23
CN200610157046 2006-11-23
PCT/CN2007/002969 WO2008061432A1 (fr) 2006-11-23 2007-10-17 Circuit de génération de signal permettant de détecter un état de masse

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US20090315538A1 US20090315538A1 (en) 2009-12-24
US8134371B2 true US8134371B2 (en) 2012-03-13

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CN102288851A (zh) * 2010-06-17 2011-12-21 中兴通讯股份有限公司 一种检测工作地和保护地连接的装置
CN103076561B (zh) * 2012-12-27 2015-01-14 马惠馨 开关检测电路及其检测方法以及具有该电路的两用智能灯
CN103278729B (zh) * 2013-05-03 2015-10-28 国家电网公司 高压测试用接地状况测试仪
GB201505832D0 (en) 2015-04-04 2015-05-20 Ubiqutek Ltd Apparatus and method for electrically killing plants
CN106066443B (zh) * 2016-06-07 2018-07-10 浙江医药高等专科学校 一种安全接地检测器的采样电路及安全接地检测器

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CN100458455C (zh) 2009-02-04
US20090315538A1 (en) 2009-12-24
CN1987499A (zh) 2007-06-27
WO2008061432A1 (fr) 2008-05-29
CN101883988A (zh) 2010-11-10

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